Insulator-pin



No. 772,553. PATENTED 0011s, 1904.

' J. H. BULLARD.

I INSULATOR PIN. APPLICATIDN FILED AUG. a, 1903.

no MODEL. 2 SHEETS-SHEET 1.

N 772,553, PATBNIED OCT. 18, 1904 J. H. BULLARD.

INSULATOR PIN.

I APPLIGATIOR FILED AUG. a, 1903. v

o MODEL. v 2 sums-sum a.

- UNITED STATES Patented October is, 1904.

PATENT- OFFICE.

INSULATOR-PIN.

SPECIFICATION forming part of Letters Patent No. 772,553, dated October 18, 1904.

Application filed August 8, 1903.

T0 aZZ whom, it may concern: 7

Be it known that I, JAMES H. BULLARD, a citizen of the United States,residing at Springfield, in the county of Hampden and State of Massachusetts, have invented new and useful Improvements in Insulator-Pins, of which the following is a specification.

This invention relates to insulator-pins, and

especially to pins for insulators adapted to carry lines over which high-tension currents are transmitted, the object of the invention being to provide metal pins of this character which shall possess the requisite strength and at the same time be as light as possible and of low cost of manufacture and which may be packaged for shipment in compact form to reduce as far as possible the cost of transportation; and the invention consists in the construction described in, the following specification and clearly pointed out in the claims thereunto annexed. In the drawings forming part of this application, Figure l is a side elevation of a pin embodying the invention, showing it applied to a cross-bar. Fig. 2' is an elevation of one of the pin members viewed at right angles to Fig. 1. Fig. 2 is a sectional view of the insulator mounted on the pin member. Fig. 3 is a plan view of the pin member shown in elevation in Fig. 2, the extremities of the pin being shown bent inward, as in the dotted-position in Fig. 2. Fig. i is a cross-section on line 4 4:, Fig. 2. Fig. 5 is a plan view of the pin in its completed form shown as applied to a cross-bar. Fig. 6 is a sectional view on line 6 6, Fig. 1, showing the connection of a pin member with the clamp. Fig. 7 is an elevation, on a somewhat smaller scale, of a modified construction of the clamping devices. Fig. 8 is a sectional plan view on line 8 8, Fig. 7 Fig. 9 is a plan view of the top of the clamp shown in Fig. 7, and Fig. 10 is a plan view of the upper and under side of a clampingplate.

Heretofore it has been customary in insulater-pins of this class to use a wooden pin slightly tapered and driven into a hole bored in the cross-bars. These having been found unsatisfactory as to durability, have been replaced by tubular iron pins made of wrought- Serial No. 168,767. (No model.)

iron pipe swaged down to a taper at either end thereof, one end being driven into the hole in the cross-bar made for the wooden pin, the insulator being secured to the opposite end. However, these have proved to be expensive substitutes, owing to the labor involved in their manufacture and the high cost of the material, and generally have only been employed in repair-work to replace the wooden pins in order that the cross-bars already in position might be utilized.

This invention in its preferred form provides for the attachment of the pin to the bar Without boring through the latter the relatively large hole necessary to receive the old wooden pin or its substitute. In its modified form the clamping devices for the pin are adapted to utilize the cross-bars already in position in effecting repairs on lines already in position provided with the old wooden pins or their substitutes referred to. It is also to be borne in mind that these high-tension lines are as a rule utilized for the purpose of transmitting power from a remote source not infrequently isolated from the usual routes of transportation, and a large factor in the cost of these pins consists in transportation charges to the point where they are to be utilized, and it is therefore essential that the greatest possible strength with the least possible weight should be attained, together with such a form of construction as will permit the shipment of the various parts in compact form.

In carrying out my invention I construct the pin proper of bar-iron, preferably round, the pin comprising, preferably, two separate portions or members a and t, which letters indicate' these parts as a whole. Each of the parts is of V shape, the two sides at the apex being substantially. parallel, whereby when they are secured to the cross-bars in operative positionthey will at this point constitute a head made up of vertically-disposed portions, over which the insulator may be fitted and to which it may be secured. Below this head the legs of the pinmembers a andt spread. outwardly more or' less, their lower ends being separated by a distance substantially equal to the thickness of the cross-bars, this construction being clearly shown in Figs.

l, 2, and 5. The preferred manner of apply 111g these pin members to the crossbar 1s shown in Figs. 1 and 5, and itconsists in loeating each of the pin members a and b astride of the bar, (though this is not essential to the proper support of the device,) the separated ends of said members being secured opposite one another on said opposite sides of the crossbar by any suitable means, but preferably by means of clamping-plates substantially such as herein described.

It will be observed that near the apex of the pin members a bend is made, as at c, Fig. 1, whereby when the two members are placed together, as in Fig. 5, the upper ends of each member will be parallel. Preferably, also, from the point indicated by c and upward therefrom the two sides of each member are pinched together, as at (Z, Fig. 2; but at the extreme upper end, where the bend is made, it is preferred to deave an opening 6,. whereby the upper extremity of each member is a litte wider than the portion below. This results when the two members a and Z) are put together in operative position in the formation of a head whose upper extremity is slightly larger than the lower extremity thereof, to the end that when the insulator (Z' is fitted over this head and cement 6Z2 or other material poured in to secure it thereto, as shown in Fig. 2, the insulator will be more ,securely attached than if the head were of uniform diameter. The cement will also fill the opening a formed in the upper end of each of the pin members. This construction results in practically a solid head made up of four vertically-disposed parallel columns, as shown in Fig. 4 in section, the spaces between the contiguous edges of which serving as channels whereby the cement may beintroduced into the socket in the insulator, these sockets being interior] y threaded, corrugated, or roughene The lower end of the legs of the pins are turned outwardly, as at f, (shown in the various figures of the drawings from 1 to 6, inclusive,) and suitable clamps g are applied to opposite sides of the cross-bark. to clamp these ends of the pins to the bar by means of a bolt passing centrally through the clamps and cross bar. As shown in Fig. 6, the clamps g are grooved to receive the lower ends of the parts a and band are provided with suitable perforations to receive the outturned ends f of the pins.

Arranged transversely of the clamp (see Figs. 5 and 6) substantially on the line of the bolt i are two ribs Z11, adapted to be forced into the cross-bar when the nut on the bolt 6 is tightened up, and at the lower edge of the clamps other ribs, in, are provided, it being of course immaterial whether these ribs are located at one point or another on the clamp.

The construction just described is that which is preferred for all new work, although it is quitefeasible to apply it to a bar from which the wooden pin has been removed; limit is better when this form of pin is to replace the old wooden pinin order not to further weaken the bar by a second hole for the bolt 2 to clamp the pin to the bar by means of the devices illustrated in Figs. 7'to 10 of the drawings. This fastening device consists of a tubular portion m, having a transversely-located partition a, centrally perforated to receive a bolt 0,. the wall of said tubular portion being perforated, as indicated at p, Fig. 7, to receive a spike or pin, which may be driven through the bar to hold said portion securely therein. The upper end of said tubular portion is provided with a flat head 9, having diagonally arranged grooves r therein to receive the lower ends of the pin, which in this construction are inturned instead of being outturned, as in the preferred construction. At the outer ends of the grooves r a curb s is provided to prevent the legs of the pin from spreading. The ends of these legs being located in the grooves '1, the clampingpieoe t is fitted over the ends of the legs lying insaid grooves r and the nut on the bolt 0 is turned up, thereby causing the inturned ends of the legs of the pin to be gripped between the clamping-plate t and the head 9. The under side of the clamping-plate is provided with grooves u, similar to the grooves a" and registering therewith, and at that point of the clamping-plate which engages the leg of the pin is a semicircular groove 4) to partially encircle the latter.

From the foregoing description it is seen that the pin members are identical in construction, thus permitting them to be packaged in very compact form for shipment, the same being true of the clamps. Furthermore, this identity of parts very materially reduces the cost of manufacture.

Having thus described my invention, what I claim, and desire to secure by Letters Patent of the United States, is-

1. An insulator-pin comprising a plurality of converging rods or bars; an insulator fitted loosely over the converged ends of the latter, said ends being arranged to provide channels between their outer surfaces and the insulator, whereby plastic material may be poured into a socket, in the insulator, to secure the latter to the rods, and to secure the rods together as one piece; and means to secure the free ends of said rods or bars to a cross-bar.

2. An insulator-pin comprising two truss portions, each made of a single bar of metal bent to V shape, the members of which truss portions converge when in operative position to constitute a head over which an insulator may be fitted, whereby the ends of said truss portions are secured together, and means securing the free separated ends of a truss portion to a cross-bar.

3.- An insulator-pincomprising a plurality of converging rods or bars, an insulator fitted 5. An insulator-pin comprising a plurality of converging members each of said members consisting of a rod or bar bent into V shape, an insulator fitting over the ends of said V shaped members securing them together at the point of their convergence, clamping means for the free ends of said members consisting of plates with Which said free ends engage in pairs, and means to secure said plates to a cross-bar.

JAMES H. BULLARD. W'itnesses:

WM. H. GHAPIN,

I. OLEMONs. 

